त्रैराशिक · Chapter Overview
From Līlāvatī, taught by Acharya T Krishnatrey. This lesson is free to read.
<pre data-block="statement">What this chapter covers | The trairāśika chapter teaches the "rule of three" — the engine of all practical arithmetic: from three known quantities in proportion, find the fourth. It names the three parts of a proportion (pramāṇa the given measure, phala the given fruit, icchā the desire quantity) and gives the rule (phala × icchā) ÷ pramāṇa, extended to compound proportion (rule of five, seven, …). A worked interest example and a knowledge check follow.</pre>